Question

If a moving ball A collides with another moving ball B, then:

• A. momentum of A= momentum of B
• B. (momentum of A+ momentum of B) before collision = (momentum of A + momentum of B) after collision
• C. neither A nor B
• D. A or B both are possible

Answer 1

The correct option is B

(momentum of A+ momentum of B) before collision = (momentum of A + momentum of B) after collision

1. The amount of motion contained in a body is called its momentum.
2. According to the law of conservation of momentum, “ When two bodies collide with each other then the total momentum before the collision is equal to the total momentum after collision provided no external forces are acting on the bodies.”
3. Thus, when a moving ball A collides with the moving ball B then the total momentum of ball A and ball B before the collision is equal to the total momentum of ball B and ball A after the collision.

Thus,

Option b) (momentum of A+ momentum of B) before collision = (momentum of A + momentum of B) after collision is the correct option.